Fermilab Result of the Week
Today, Fermilab Today launches a new feature. Each Thursday, Fermilab Today will bring
readers a new scientific result from ongoing research at Fermilab.
Today's inaugural story features two results, one from CDF and one from
DZero, both focusing on the fascinating search for extra dimensions beyond
the familiar three of space and one of time. Future Thursdays will bring more
forefront results from the collider collaborations as well as from neutrino
experiments, astrophysics and accelerator physics research.

DZero: Particle Pairs and Monojets
The hypothesis of extra dimensions in space large enough to be detectable
by existing or near-future experiments is by far the most revolutionary
attempt to solve the hierarchy problem of the Standard Model. No wonder
it has captured the public's imagination and inspired experimentalists
around the world.

In 2000, DZero pioneered
searches for extra dimensions at proton colliders by looking for
anomalies in the production of pairs of electrons and photons due
to the effects of gravitational interaction amplified by extra space.
Two years later DZero was first to look
for production of "monojets" - single remnants of a quark or a gluon
recoiling against the invisible graviton disappearing in extra dimensions.

Now, with the higher energy of the Tevatron and more data, DZero continues the quest. In the new result
unveiled at Lepton-Photon 2003, DZero has extended the search by looking for
pairs of electrons, photons,
and
muonsand set the most stringent limits on their existence to date.

While no evidence for extra space has been found so far, we plan to increase our
sensitivity by another factor of two in the next three years.

CDF: The Bulk and The Brane
We may live in a world that has more than the usual four dimensions
(one time dimension + 3 space dimensions) of our everyday experience.
Indeed, one way to explain the peculiar properties of gravity is that the
universe extends in 4+n dimensional space (the bulk) while we are trapped
in the familiar 4 dimensional world (the brane).

Our website
illustrates a proton and antiproton colliding in the brane to send a
graviton out of the brane, carrying away energy and momentum. We observe
the "missing energy" signature of this escaping graviton
(called a Kaluza-Klein particle), similar to the way the existence
of neutrinos is inferred in collider experiments.

The result of our analysis is to constrain at 95% confidence level the value of the
effective Planck Scale for 2,4, and 6 extra dimensions to be greater
than 1 TeV, 0.77 TeV, and 0.71 TeV, respectively, the best result from
a direct graviton emission search at the Tevatron.

Note that the Tevatron
is now running at a higher energy (approximately 2 TeV) and that we will
soon have many times the data sample analyzed here. This will make us sensitive to an effective Planck Scale as high as 1.5 TeV for two extra dimensions.

Maria Spiropulu (left) of the University of Chicago and Kevin Burkett of Fermilab are working on CDF's search for extra dimensions.

FYI: AIP Bulletin of Science Policy News,
September 16, 2003Senate Appropriations Report Language on NSF
Accompanying the recently drafted Senate FY 2004 VA, HUD, and Independent
Agencies Appropriations Bill is a report spelling out the details of the
committee's recommendations regarding the National Science Foundation.
Selections from Senate Report 108-143 are below; the full report may be
accessed at http://thomas.loc.gov/ See FYI #114 for a summary of funding
differences between the Senate and House versions of this legislation.
read more

September 15 - September 17
All shifts began in shutdown.

On Monday, the Beams Division Head revoked permission to operate all of the accelerators except for the Preaccelerator. Before an accelerator can run again each accelerator will have to perform the required safety checks and complete a restart form, which the Division Head must approve. Around 9 AM the power for the MI-8 transfer line from Booster to the Main Injector (MI) was switched to a generator.Read more of the current accelerator updateView the Tevatron Luminosity Charts

Third Annual Writing Contest
The Fermilab Creative Writers Club announces the Third Annual Writing Contest.
Winners will get cash prizes! Participation is open to all members of Fermilab
family. Entries will be judged in three categories: Short story (no more than
5000 words), Short-short story (less than 500 words) and Poetry (50 lines or
less). Entries must be received no later than September 30. Results will be
announced October 31.more information

Doubles Tennis League
Play is held on Sundays from 4-8 p.m. in the Recreation Facility. You must be a
current Recreation Facility member to participate. League begins October 26.
Contact Steve Kuhlmann for more information.

Borders - Corporate Appreciation Days
The Borders bookstore in Geneva will include employees of Fermilab in their Corporate Appreciation Days. From September 19-25, all employees will
receive a 20% discount on most items in the Geneva store. Bring your
Fermilab ID to receive the discount.